A device mounting mechanism that loads a device into an internal space within a plurality of columns constituting a rack mount includes: a pair of columns provided parallel to each other; mounters respectively supported by the pair of columns so as to be movable in a direction intersecting a plane containing these columns; and a mount bar supported substantially horizontally by connecting one end to one mounter and the other end to the other mounter so as to be rotatable about shafts substantially parallel to the columns. The mount bar supports an upper surface of the device within a space surrounded by the columns, and at least one of the one end and the other end is connected to a shaft so as to be movable in a direction connecting the shafts.